title: Disordered La3Cu4.88Se7.
abstract: The crystal structure of copper(I) lanthanum selenide, La(3)Cu(4.88)Se(7), obtained from the La(2)Se(3)-Cu(2)Se quasi-binary system, has been investigated using X-ray single-crystal diffraction. The positions of the La and Se atoms are ordered and lie on mirror planes, whereas all positions for the Cu atoms are partially occupied. The crystal is built from edge-sharing [LaSe(6)] and [LaSe(7)] polyhedra. The five positions for the Cu atoms determine an ionic diffusion pathway in the structure.
authors.affiliation: Department of Ecology and Protection of the Environment, Volyn National University, Lutsk, Ukraine.
authors.forename: L D
authors.initials: LD
authors.lastname: Gulay
authors.forename: M
authors.initials: M
authors.lastname: Daszkiewicz
authors.forename: O M
authors.initials: OM
authors.lastname: Strok
authors.forename: A
authors.initials: A
authors.lastname: Pietraszko